The 2000 outburst of the recurrent nova CI Aquilae: Optical spectroscopy
Abstract
We present low- and medium resolution spectra of the recurrent nova CI Aquilae taken at 14 epochs in May and June, 2000. The overall appearance is similar to other U Sco-type recurrent novae (U Sco, V394 CrA). Medium resolution (lambda /Delta lambda ~7000-10 000) hydrogen and iron profiles suggest an early expansion velocity of 2000-2500 km s-1. The Hα evolution is followed from Delta t = -0.6 d to +53 d, starting from a nearly Gaussian shape to a double peaked profile through strong P-Cyg profiles. The interstellar component of the sodium D line and two diffuse interstellar bands put constraints on the interstellar reddening which is estimated to be E(B-V)=0fm85 +/-0fm3 . The available visual and CCD-V observations are used to determine t_0, t_2 and t_3. The resulting parameters are: t_0=2451669.5 +/- 0.1, t_2=30+/-1 d, t_3=36+/-1 d. The recent lightcurve is found to be generally similar to that observed in 1917 with departures as large as 1-2 mag in certain phases. This behaviour is also typical for the U Sco subclass. Based on the data obtained at the David Dunlap Observatory, University of Toronto, Canada.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 2001
- DOI:
- 10.1051/0004-6361:20010015
- arXiv:
- arXiv:astro-ph/0011270
- Bibcode:
- 2001A&A...366..858K
- Keywords:
-
- STARS: NOVAE;
- STARS: INDIVIDUAL: CI AQL;
- Astrophysics
- E-Print:
- 8 pages, 7 figures, accepted for publication in A&